Guo, L
Gao, R
Xu, J
Jin, L
Cotrim, A P
Yan, X
Zheng, C
Goldsmith, C M
Shan, Z
Hai, B
Zhou, J
Zhang, C
Baum, B J
Wang, S
Article History
Received: 14 December 2013
Revised: 26 April 2014
Accepted: 6 June 2014
First Online: 17 July 2014
Competing interests
: The authors declare no conflict of interest.